/Engine/Plugins/Enterprise/DataprepEditor/Source/DataprepCore/Public/DataprepOperation.h
This function is called when the operation is executed. If your defining your operation in Blueprint or Python this is the function to override.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintNativeEvent) void OnExecution ( const [FDataprepContext](API\Plugins\DataprepCore\FDataprepContext) & InContext )